C1616

DTC C1616: Cranking Signal System (ON Sticking)

Cranking signal system circuit





CAUTION:
^ If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
^ Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION
AWC-ECU receives the signal of the ignition switch from ETACS-ECU via CAN communication.

DTC SET CONDITIONS
The code is set when the cranking signal is set for five seconds or more continuously while driving.

PROBABLE CAUSES
^ Malfunction of the ETACS-ECU
^ Ignition switch malfunction
^ Damaged harness wires and connectors
^ Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q: Is the check result normal?
YES: Go to Step 3.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q: Is DTC No. C1616 set?
YES: Go to Step 3.
NO: This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code
^ Check the KOS diagnostic trouble code.
^ Check the WCM diagnostic trouble code.
^ Check the ETACS diagnostic trouble code.

Q: Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 4.

STEP 4. Scan tool data list
Item 42: Ignition switch.

Q: Is the check result normal?
YES: Go to Step 9.
NO: Go to Step 5.

STEP 5. Ignition switch check
1) Disconnect C-212 ignition switch connector, and check the continuity between the terminals No.1 and No.5 at the ignition switch side.
2) Turn the ignition switch to the "ON" position.
OK: No continuity

Q: Is the check result normal?
YES: Go to Step 6.
NO: Replace the ignition switch. Then go to Step 10.

STEP 6. Ignition switch connector, ETACS-ECU connector check: C-212, C-315

Q: Is the check result normal?
YES: Go to Step 7.
NO: Repair the defective connector. Then go to Step 10.

STEP 7. Check the wiring harness between C-212 ignition switch connector terminal No.5 and C-315 ETACS-ECU connector terminal No.7.
Check the power supply line for short (for short to the power supply) circuit.

Q: Is the check result normal?
YES: Go to Step 8.
NO: Repair the wiring harness. Then go to Step 10.

STEP 8. Scan tool data list
ETACS item No.287: Starter switch.

Q: Is the check result normal?
YES: Go to Step 9.
NO: Replace the ETACS-ECU. Then go to Step 9.

STEP 9. Check whether the DTC is reset.

Q: Is DTC No. C1616 set?
YES: Replace the AWC-ECU. Then go to Step 10.
NO: Intermittent malfunction. (Refer to How to Cope with Intermittent Malfunction).

STEP 10. Check whether the DTC is reset.

Q: Is DTC No. C1616 set?
YES: Return to Step 1.
NO: This diagnosis is complete.